Method for detecting anomaly satellite in multi-reference stations environment and apparatus using detecting method

Abstract

The present invention relates to a method of determining an anomalous satellite in a multi-reference station environment and a determination apparatus using the method, which detect an anomaly in a satellite and determine the cause of the anomaly in a multi-reference station environment, and continuously provide services in an environment in which the cause of the anomaly is removed, thus improving availability and continuity, and enhancing an integrity monitoring function. A method of determining an anomalous satellite in a multi-reference station environment according to the present invention includes a first step of individually receiving satellite signals including code measurements and carrier measurements from one or more reference stations respectively communicating with a plurality of satellites, a second step of checking whether the number of reference stations communicating with the plurality of satellites is at least 3, based on the satellite signals, a third step of detecting presence or non-presence of an anomaly state of the satellites, based on the code measurements and the carrier measurements of the satellite signals if it is checked at the second step that the number of reference stations is at least 3, a fourth step of identifying an anomalous satellite from the anomaly state of the satellites detected at the third step, and a fifth step of determining a cause of an anomaly in the anomalous satellite identified at the fourth step.

Description

TECHNICAL FIELD[0001]The present invention relates, in general, to a method of determining an anomalous satellite and a determination apparatus using the method and, more particularly, to a method of determining an anomalous satellite in a multi-reference station environment and a determination apparatus using the method, which detect an anomaly in a satellite and determine the cause of the anomaly in a multi-reference station environment having at least three reference stations, and which continuously provide services in an environment in which the cause of the anomaly is removed, thus improving availability and continuity, and enhancing an integrity monitoring function.BACKGROUND ART[0002]A Global Positioning System (GPS), which is a global navigation satellite system developed and promoted by U.S. Department of Defense (DOD), is essentially used in terrestrial, marine, and aerial fields for safe navigation. Such a GPS is also designated as a NAVSTAR / GPS from the standpoint of a s...

AI Technical Summary

Benefits of technology

[0021]The method of determining an anomalous satellite in a multi-reference station environment and the determination apparatus using the method according to the present invention are advantageous in that the present invention can detect the anomaly state of a satellite and identify an anomalous satellite in a multi-satellite reference station environment and can determine the cause of the anomaly of the anomalous satellite, as technology for securing integrity in a network Real Time Kinematic (RTK) environment.

[0022]Further, the present invention is advantageous in that it can detect an anomaly in a satellite and determine the cause of the anomaly in a multi-reference station environment having at least three reference stations, so that a service can be continuously provided in an environment in which the cause of the anomaly is removed, thus improving availability and continuity and enhancing an integrity monitoring function.

Problems solved by technology

Service interruption caused by the failure of a Global Navigation Satellite System (GNSS) may interfere with marine, aerial, and terrestrial traffic services, thus resulting in problems such as economic loss.

Technology aiming at improving accuracy which is considered to be important in geodetic survey fields has been continuously executed, but technology related to integrity, continuity, and availability, which are other performance request elements required to be utilized in application fields for positioning, is still insufficient.

The causes of anomalies in a GPS satellite may include anomalies in satellite clocks, anomalies in satellite orbits, anomalies in navigation messages, etc., and such anomalies in the GPS satellite increase an error in the pseudo-range of the corresponding satellite, exhibit an instable state in code and carrier phase measurements, and cause discontinuous points, thus resulting in which a positioning error increases.

From the standpoint of a user, there is a problem in that a known anomaly in a GPS satellite may be replaced, but the stability of a positioning service is deteriorated in the case of an unknown anomaly, thus making it impossible to provide the service.

Most of these methods have the concept of determining the presence or non-presence of anomalies using redundant measurements, and are problematic in that there are many restrictions in use and reliability is low.

Such a determination method can individually detect the presence or non-presence of anomalies in all observed satellites, but is problematic in that code measurements are used, and required performance is low, and thus it is not suitable for application to network RTK.

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